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My wife’s 1999 Honda CRV threw a P1456 recently, which is an evap leak on the tank side of things. The common cause seems to be a loose or nonfunctional filler cap.
But my cap is is good shape.
What is not in good shape in the steel filler neck tube and its attached smaller “vapor line”. The lower section of the steel filler neck connects to a large rubber hose going to the tank and a small rubber hose which is the vapor hose. Both hose clamps have rusted away in this area and the filler neck steel is highly rusty and looks crumbly.
I can buy a new steel filler neck for 60 or 70 dollars, but I’m not sure how to get the old one out, or the new one in.
Has anyone done this and can guide me threw the process? I’ve done a bit of net searching, but cannot find a procedure for the 1999 Honda CRV Thanks.
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I can’t find any good info to exactly show what you need. I know this is a different model
but may give some insight. 🙂Thanks Moderator.
I found that video pretty quickly as well, and it is a bit helpful. But the CRV’s filler pipe has some important differences.
First, my filler pipe location is much tighter with lots of “frame and suspension stuff” very close to it, and I can’t visualize how to pull it out once the bolts are removed and the hoses slipped off.
Second, I’m slow to figure out how the pipe is attached at the top at the fender. Some pipes (Dorman) seem to be sold complete with the top plastic piece, and some pipes are sold without the plastic top mount piece.
My best guess at this point is that the CRV’s filler pipe has to be removed, up, through, and out of the square hole in the fender. And the new pipe, down and though the fender.
I have the Honda factory workshop manual and it fails to address “fuel filler pipe replacement”
I’ll be grateful for further help.
Thanks.
Before you dive into the filler neck, perhaps check it for leaks to be sure that is indeed the issue. You can make a home made smoke machine to check for this.
it would be a real shame to go through all that time and expense and it wasn’t the source of the problem.
BTW baby oil works really well for the smoke and smells nice.
Good luck and keep us posted.
Thanks Eric.
Smoke would be a nice way to see the leaking filler neck for an accurate diagnosis, and avoid the possibility of wasted money and effort.
The video of the homemade smoke machine did make me cringe a bit from a safety standpoint, as smoke is combustible and can flash fire. And smoke is dirty sooty grime that I’m not sure I want in the car’s fuel system. Even if the 1999 Honda CRV is a bit of a beater.
What I may try is to slightly pressurize the tank and splash some soapy water on the rusty filler neck and look for bubbles. Like we do for tire punctures.
I’ll update……………………….
The CRV has a black plastic box with emissions “stuff” just inboard of the left rear tire. I inspected all the hoses in and around this black box and found things to be pretty clean and the electrical connectors looking good.
But I did find this wee bit of rubber hose all split apart. This tiny hose connected to the bottom of the tank pressure transducer to a white nylon Y shaped fitting that seems to just vent to atmosphere. So I think it is the reference atmospheric pressure for the transducer. Since it goes to atmosphere, the splits shouldn’t be causing my P1456 code. But I put in a new bit of hose anyway.
I’ll keep at it……taking frequent breaks to swear and laugh.
Gents:
I took some images of the CRV’s filler neck with the hope that a reader might have some ideas about a remove and replace process.
These first images are of the filler neck in the vicinity of the gas cap, on the outside and the inside of the left rear fender. Note that at the corners of the square plastic panel there are some plastic rivets or push fasteners. I suppose if I can’t undo these I can drill them our and replace with some nylon machine screws.
Pretty good resolution so zooming shows details.
Has anyone taken this top filler neck assembly off? Thanks.
[quote=”Rereonehundred” post=142083]
The CRV has a black plastic box with emissions “stuff” just inboard of the left rear tire. I inspected all the hoses in and around this black box and found things to be pretty clean and the electrical connectors looking good.But I did find this wee bit of rubber hose all split apart. This tiny hose connected to the bottom of the tank pressure transducer to a white nylon Y shaped fitting that seems to just vent to atmosphere. So I think it is the reference atmospheric pressure for the transducer. Since it goes to atmosphere, the splits shouldn’t be causing my P1456 code. But I put in a new bit of hose anyway.
I’ll keep at it……taking frequent breaks to swear and laugh.[/quote]
So here is an update guys.
Things worked out well, but I don’t really know why. Recall that it was all about my 1999 Honda CRV P1456 evap tank side code.
I filled the filler neck brimming and overflowing with gasoline and saw no leaks or gasoline dampness anywhere. So concluded it was tight.
I ripped into the black plastic emissions box that is just inboard of the left rear wheel. And thats where I found this little perished hose going from the fuel tank pressure sensor to the little Y connector, See items 7 and 8 in the attached image. The bottom part of that Y connector has a small hole vented to atmosphere, so I reasoned the cracked hose on an atmospheric vent would not be a cure. But I renewed this hose anyway.
Guess what. It cured my P1456 for about a month now, and today I passed the OBDII “ready” emissions test including the “eavp ready”. All for a 2 cent hose.
But I don’t know why this fixed the problem. Perhaps this orifice in the Y connector is some sort of air jet that blends a metered amount air into the fuel tank at a prescribed rate during the “vacuum hold” test. And maybe the split hose created too big an orifice, so I was failing the vacuum test.
If someone knows how this system works, I’d enjoy the enlightenment. Thanks
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